Turret head for lathes



July 2, 1946. r s o 2,4Q3A95 'TURRET- HEAD FOR LATHES Filed July 26, 1945 2 Sheets-Sheet l lNVENTOR FRANK 'SIROLA F. SIROLA TURRET HEAD FOR LATHES Filed July 26,- 1945 2 Sheets-Sheet 2 INVENTOR 'ATTORNIEY July 2, '1946.

7 mm. Emm- H L- Patented July 2, 1946 UNITED STATES PATENT OFFICE 6 Claims.

This invention relates to new and useful improvements in a turret head for lathes.

More specifically, the invention proposes the construction of an improved turret head which is characterized by tool holders in which the tools may be horizontally adjusted, and in which the tool holders themselves are vertically adjustable for vertical adjustment of the tools.

Still further, it is proposed to provide a turret head, as aforesaid, including a four-sided body, each of sides being provided with a vertical dovetail tongue, tool holders vertically slidable on the tongues and each having an upstanding screw on which a nut is threaded, the nuts havin flanges bearing against the top face of the body and being adapted to coact with slotted eccentrics which hold the nuts against vertical movement, thereby inducing vertical movement of the tool holders upon rotation of the nuts.

Another object is to provide a tool holder for the aforesaid turret head especially adapted to hold a boring tool.

Another object is to provide a tool holder for the aforesaid turret head especially adapted to hold a cutting or parting tool.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying drawings forming a material part of this disclosure:

Fig. 1 is a perspective view of a turret head constructed in accordance with this invention, a lathe being indicated fragmentally in dot-dash lines.

Fig. 2 is a plan view of the head of Fig.

Fig. 3 is a side View of the head of Fig. 1.

Fig. 4 is a section on the line 44 of Fig, 2, parts being shown in full.

Fig. 5 is a section on the line 55 of Fig. 4.

Fig. 6 is a section on the line 6-6 of Fig. 4.

Fig. 7 is a perspective view of a boring tool holder adapted to be used in place of the tool holder of the head shown in Fig. 1.

Fig. 8 is a perspective View of a cutting or parting tool holder adapted to be used in place of the tool holder of the head shown in Fig. 1, a parting tool being shown assembled with th tool holder.

Fig. 9 is a fragmentary top plan view showing a modified form of the invention.

Fig. 10 is a vertical sectional View taken on line Ill-10 of Fig. 9.

The turret head for lathes, in accordance with this invention includes a body or carrier I 0, adapted to be mounted upon a lathe A (Fig. 1), and having a plurality of vertical dove-tail tongues I I, one of each of the four sides of the carrier.

At the center of each of the tongues, the carrier has a bore provided with several diameters. That is, at the bottom of the carrier is a short bore l2, thereabove a larger bore 13 opening at one side through the side of the tongue and thereabove a still larger bore [4 also opening at one side through the side of the tongue. The bores are aligned and in each set of aligned bores is an eccentric pin I5 having a journal I6 in bore 12, a cam I! in bore l3, and a journal H3 in a disc 19 in bore 14. Above the journal I8 the pin has a groove 20 and thereabove, forming the top wall of the groove, an integral disc 2| having a flat side 22. Above disc 2| the pin has a head 23 for a wrench. There are four pins.

A filler piece 24 rests on top of the carrier and has a flange overlapping each of the discs 19, holding them in place on the carrier. Filler piece 24 has a centra1 bore in lin with a central bore 26 in the carrier. The carrier further has two diametrically opposed bores 21 forming recesses for coil springs 28, the bores 27 opening through the bottom of the carrier. A disc 29 is disposed below the carrier, and this disc has a circular row of sockets 39 adapted to align with the bores 21. A ball 3| is retained in each bore 21 and the aligned socket 3i] and is spring pressed toward the socket 351 by the spring 28. A sleeve 32, integr-al with the disc 29, extends upwardly through the bores and 25 and above the filler piece where it is threaded. A hub 33 is threaded on the threaded end of the sleeve and tightened sufiiciently to prevent the balls 3| from falling out between the bottom of the carrier and the disc 29. A handle 34 is integral with the hub for op erating same. Hub 33 acts as a nut, bolting down the filler piece.

A stem 35 is disposed in the hollow interior of the. sleeve and extends through and below the disc 29. The upper end of the stem is threaded and a nut 36 is screwed thereon. The lower end lies below the disc 29 and is integral with a slide block 31 adapted to be employed for securing the turret head with a lathe 33 in the usual manner. The slide block can be quickly secured in or removed from the lathe merely by turning the handle 34 to loosen the hub 33. After the turret is connected to the lathe, the turret may be turned to different positions, the balls riding from one pair of opposed sockets to another.

A tool holder 39 is vertically slidably mounted Each tool holder has four set screws, as is clearly.

shown in Fig. 2. Each tool holder also has ex-'- tending upwardly from its center, a threaded stud 43 flat along two opposite sides. A nut id is threaded on each stud 53, each nut having aroughed part for use in tightening it manually or with a wrench. Each nut 44 also has a flange d5 extending into the adjacent groove 23.

The operation of the turret head is as follows:

First. the tools :are secured; in. the. tool holders by merely. placin them in: the; grooves; in: the toolhoiders and then securing theinthereinthy meansof the screws iii Theturretihead is then assemble: vwitlrthe latheby means; of the slide block 32, the handle being. turned-first. tczlc-osenthe sleeve so that'the slide block can. be slid into the lathe, and then to tighten it.

to loci: the-slide blockin place'..

Next; the tool holder beingusedirnust bead; justed vertically. Todo this, the eccentric. pin is turned by means of. a wrench:appliedto-the fitting. or. head. so that the flat' side 22/ is.

toward. the flange The nuti i lis then turned. As the nut ml rests on top of t-hedisc 59s the tool holder either raises or lowers depending upon.

the direction of rotation of the nut 65; When the proper vertical position has been reached,.

the wrench isturned; turning the eccentric pin so that the top wall or flange 2| overliesthe flange fiat side ZZ It-hen being rotated away from the flange 55- in the groove and thetool holder cannot move vertically, At the-same time that'the flat side 22 isrotaiedawavirorn the flange 5, the cam 25' is rotated, jamming against the inner face oi the tool holder and wedging the dove-tail tongue in tliedove-tail groove,,furt-her securing the tool holder rigidlyto the carrier;

The tool holder maybeused with the turrethead in place of thetool holder 39 iidesired. and

the same true oi the tool holder 3&3" oi'Fig. 8;

The tool holder 39- distinguishes-ironrtlie tool holder 33 in that the grooved? has a V-shaped channel ,5 in its bottom-wall adapting it to hold a boring tool.

of the set screws.

Other parts of the tool holdersof Figs. 'l and 8 corresponding to similar parts of the tool-holder of Fig. 1 are indicated by like references-with one or two accents added'respcctively.

In Figs. Sand 10 a verticalsliding-wedgel5 is" against the inciined surface lli of the carrier. Ill-' In other respects this form of the invention is LLU",

shown to be operable by aholt similar to the previous form; and similar parts may be recognized by. the same numerals with an accent added.

While I have illustrated and describedithe pre ferred embodiments of my invention, it-is =to-be understood that I do-not-limit myself to the pre ciseconstructions herein disclosed and the right Thus the flange t'z'i is locked The tool-holder 39" distingui' ies from tlietool'holder 39 in that it hasra-sriallow groove-M" for holding a parting tool di' and camdisc'fi i are employed for holding tlietool instead is reserved to all changes and modifications coming within the scope of the invention as defined in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by United States Letters Patent is:

1. A turret head for a lathe comprising a carrier having four sides, each provided with a dovetail.tongue, a vertical bore adjacent each side and opening through the. side. of the adjacent tongue, and a central bore, slide block means in said central bore for connecting said head to said lathe, a tool holder slidably mounted on each of said tongues, each of said holders having a vertically, upstanding threaded stud, an eccentric pin in each of said vertical bores, having journals at its ends, the bottom journals fitting in hearings in. said carrier, each pin having a cam portion between said journals adapted to engage the inner face of the adjacent holder ior locking said holder'whensaid' pin is rotated; a hearing disc oneach pin top' journ'al'fittingin a recess insaid carrier top wall; a nut"threadedon-each of said studs, each or: said nuts having a flangeaoutting' the top or" the; adjacent hearing disc and adapted, when said cam portion does not lockthe holder, to move the holder vertically'depend'ent upon the direction of rotation of" said nut; each of said eccentric pins having a groove in which the adjacent nut flange fits, the top wall'oi'saidgroove having one flat sid'e adapted; whenturned'toward saidadjacent nut, to leave the flange of the nut uncovered. whereby when said eccentric pin is rotated to lock said holder by. its said cam portion 'said top wall'. oi. saidj groove overlies said nut flange, and meansoverlying the. inner edges of said bearing discs, holding them against said carrier. 1

2. Aturret head for a lathe. comprising a carrier having four sides, each providedwith a dovetail tongue, a vertical bore adjacent each side and opening through the side of the adjacent tongue, and a central bore, slide; block. means in said central bore for connecting saidhead to said lathe, a tool holder slidably mounted on each-of said-tongueseach of said holders having,

a vertically upstanding threaded stud, an eccentric pin in each of said vertical bores having journals at its ends, the bottom journals fitting in bearings in said carrier; eachpin having a cam portion between said journals, vadaptedto engage the inner face of the adjacent holder for locking said holder when said-pinisrotated, a bearing disc on each pintop journal fitting in a recess in'said 'carrier top Wall, a nut threaded on each of said studs, each of said nuts having a flangeabutting the-top of the. adjacent bearing disc and adapted, when said-cam portion doesnot-lockthe holdengto move the' holder vertically dependent upon the direction of rotation of said nut,- each.

of saideccentric pins having a groove in which the adjacentinut flange fits,,the topwall of said groove havingjone fiat side adapted, when turned towardtsaid adjacent nut, to' leave the flange of the nut uncovered whereby'when sai heccentricv pin is. rotated .toplock said' holderby its: said .cam portion said:top wall of saidrgroove overlies-said nutzflange, and means. overlying the inneredges.

of saidzbearing, discs, holding; them against: said carrier; said holders each-including;a horizontal slot for receiving a toolgandfour studs:for=lock1- ing saiditool in said slot:

3. A turret head for a lathe comprising acar rierthaving'zfouitsides, eachiprovidedwithtaidovetail tongue, a vertical bore adjacent each side and opening through the side of the adjacent tongue, and a central bore, slide block means in said central bore for connecting said head to said lathe, a tool holder slidably mounted on each of said tongues, each of said holders having a vertically upstanding threaded stud, an eccentric pin in each of said vertical bores having journals at its ends, the bottom journals fitting in bearings in said carrier, each pin having a cam portion between said journals, adapted to engage the inner face of the adjacent holder for locking said holder when said pin is rotated, a bearing disc on each pin top journal fitting in a recess in said carrier top wall, a nut threaded on each of said studs, each of said nuts having a flange abutting the top of the adjacent bearing disc and adapted, when said cam portion does not lock the holder, to move the holder vertically dependent upon the direction of rotation of said nut, each of said eccentric pins having a groove in which the adjacent nut flange fits, the top wall of said groove having one flat side adapted, when turned toward said adjacent nut, to leave the flange of the nut uncovered whereby when said eccentric pin is rotated to lock said holder by its said cam portion said top wall of said groove overlies said nut flange, and means overlying the inner edges of said bearing discs, holding them against said carrier, said holders each including a horizontal slot for receiving a tool, and four studs for looking said tool in said slot, each of said holders having a channel in the bottom wall of its slot.

4. A turret head for a lathe comprising a carrier having four sides, each provided with a dovetail tongue, a vertical bore adjacent each side and opening through the side of the adjacent tongue, and a central bore, slide block means in said central bore for connecting said head to said lathe, a tool holder slidably mounted on each of said tongues, each of said holders having a vertically upstanding threaded stud, an eccentric pin in each of said vertical bores having journals at its ends, the bottom journals fitting in bearings in said carrier, each pin having a cam portion between said journals adapted to engage the inner face of the adjacent holder for locking said holder when said pin is rotated, a bearing disc on each pin top journal fitting in a recess in said carrier top wall, a nut threaded on each of said studs, each of said nuts having a flange abutting the top of the adjacent bearing disc and adapted, when said cam portion does not lock the holder, to move the holder vertically dependent upon the direction of rotation of said nut, each of said ec centric pins having a groove in which the adjacent nut flange fits, the top wall of said groove having one flat side adapted, when turned toward said adjacent nut, to leave the flange of the nut uncovered whereby when said eccentric pin is rotated to lock said holder by its said cam portion said top wall of said groove overlies said nut flange, and means overlying the inner edges of said bearing discs, holding them against said carrier, each of said holders having a horizontal slot for receiving a parting tool and two cam washers for securing said tool in said slot.

5. A turret head for a lathe comprising a carrier having four sides, each provided with a dovetail tongue, a vertical bore adjacent each side and opening through the side of the adjacent tongue, and a central bore, slide block means in said central bore for connecting said head to said lathe, a tool holder slidably mounted on each of said tongues, each of said holders having a vertically upstanding threaded stud, an eccentric pin in each of said vertical bores having journals at its ends, the bottom journals fitting in bearings in said carrier, each pin having a cam portion between said journals adapted to engage the inner face of the adjacent holder for locking said holder when said pin is rotated, a bearing disc on each pin top journal fitting in a recess in said carrier top wall, a nut threaded on each of said studs, each of said nuts having a flange abutting the top of the adjacent bearing disc and adapted, when said cam portion does not lock the holder, to move the holder vertically dependent upon the direction of rotation of said nut, each of said eccentric pins having a groove in which the adjacent nut flange flts, the top wall of said groove having one flat side adapted, when turned toward said adjacent nut, to leave the flange of the nut uncovered whereby when said eccentric pin is rotated to lock said holder by its said cam portion said top wall of said groove overlies said nut flange, and means overlying the inner edges of said bearing discs, holding them against said carrier, said slide block means including a disc beneath said carrier having a row of recesses, two balls in diametrally opposite recesses, springs in bores in said carrier pressing down on the top of said balls, a hollow sleeve integral with and extending upwardly from said. disc, a handle secured to the top of said sleeve, a slide block disposed beneath said disc and having a stem extending upwardly through said sleeve, and a nut on the top of said stem preventing disassemblage of said stem from said sleeve.

6. A turret head for a lathe comprising a carrier having four sides, each provided with a dovetail tongue, a vertical bore adjacent each side and opening through the side of the adjacent tongue, and a centralbore, slide block means in said central bore for connecting said head to said lathe, a tool holder slidably mounted on each of said tongues, each of said holders having a vertically upstanding threaded stud, an inclined surface at the bottom of said carrier, a vertically slidable wedge adapted to be engaged against the said inclined surface of the carrier and a bolt rotatably engaged in the said wedge for locking said holder in position, a nut threaded on each of said studs, each of said nuts having a flange abutting the top of the adjacent bearing disc and adapted, when said cam portion does not lock the holder, to move the holder vertically dependent upon the direction of rotation of said nut, each of said eccentric pins having a groove in which the adjacent nut flange fits, the top wall of said groove having one fiat side adapted, when turned toward said adjacent nut, to leave the flange of the nut uncovered whereby when said eccentric pin is rotated to lock said holder by its said cam portion said top wall ofsaid groove overlies said nut flange, and means overlying the inner edges of said bearing discs, holding them against said carrier.

FRANK SIROLA. 

